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Have you ever heard of a camera without a lens? In this activity, learners create a pinhole camera out of simple materials. They'll see the world in a whole new way: upside down and backwards!

This resource contains several mini-explorations using a slide projector as a light source to investigate light and the properties of images.

Focus sound through a balloon! In this Exploratorium activity, you'll use dry ice to create a balloon that's a sound lens.

Did you know that using a lens one can bend light to make pictures of the world? It's true!